Study rationale: Bio-ker has developed the new formulation of filgrastim BK0023 with the same active content as Neupogen®. BK0023 is expected to have the same tolerability profile and clinical effects as Neupogen® in controlling myelo-toxicity induced by chemotherapy given for the treatment of solid and haematological tumours. It is worth noting that the production and manufacturing procedures allow to have a reduction of drug cost thus it is likely to have pharmacoeconomic advantages.